Sliding beneath the Laurentide Ice Sheet, North America, at the last glacial maximum (from available data in 2018).

Modern observations probe glacial behavior under contemporary environmental forcing whereas conditions during the peak of the most recent Pleistocene glacial period may have been quite different. Aspects of past glacial behavior can be deduced from evidence preserved in the sediments and landforms that were overridden, deformed, and sculpted by former ice sheets. The files included here, generated in ArcGIS, include polygons and associated ArcMap data files summarizing those areas of strong, weak, and no evidence of sliding during the most recent ice age. These were used to produce supplementary figures 1 and 2 in a publication in Nature Communications by Meyer, Downey and Rempel (2018) "Freeze-on limits bed strength beneath sliding glaciers" (DOI: 10.1038/s41467-018-05716-1).